The basic Photoflex Speed Ring comes included with every Extra-Small LiteDome. It gives a rectangular softbox is basic structure. Your softbox still requires a shoe-mount, handle-mount flash bracket, or dedicated insert to mount to a specific light.
Standard 1/4"-20 threads in the frame allow mounting to your similarly equipped light stand top or grip equipment.
In the Box
Photoflex Basic Speed Ring for X-Small LiteDome Q39